Grinding-mill



(No Model.)

0. SIMPSON.

- GRINDING MILL.

No. 594,101. Patented Nov. 23, 1897.

UNITE STATES PATENT OFFICE.

ORVILLE SIMPSON, OF CINCINNATI, OHIO.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 594,101, dated November23, 1897'.

Application filed November 25, 1895. Serial No. 570,035. (No model.)

. such simplicity of construction and arrangement of parts as that itmay be retained in proper running relations and order Without specialskill on the part of the attendants, and also one that may be run athigh speed to grind rapidly and to be capable of quick, easy, andaccurate adjustment to grind to any desired grade of fineness.

To these ends my invention consists'in the mill herein described andillustrated, embodying the following features: a supportingframe andeasing divided into three portions on horizontal planes, the first orlower portion being the base proper and adapted to be attached to andremain permanently on the fixed foundation, the second or intermediateportion being fitted to the base and removably attached by screws orbolts and being the lower half of the housing of the stones, and thethird or upper portion being the upper half of the housing, divided fromthe lower half of the horizontal plane of the'shaft and carrying thefeed devices. The entire housing and all operating parts can thus beremoved from the base portion without disturbing the union of the basewith the foundation, and the true alinement is therefore never lost.

The invention also includes certain minor features of construction andcombination hereinafter specified.

My invention is embodied in the accompanying drawings, in which- Figure1 is a side elevation of my improved mill complete; Fig. 2, an endelevation complete, omitting the regulating-screw for adjusting thefineness of the product; Fig. 3, a partial side elevation sectionedthrough the casing and one of the shaft-bearings with a supplementalsection through the protuberance of the housing containing the pivotalsecuring the top portion A ings, Figs. 1 and 2, the latter figureshowing clearly the line of junction and mode of union with-the midportion. The immediate object of this construction is to permit all theworking parts and their attachments to be removed at will for repairs,&c., without disturbing the lower port-ion, which therefore alwaysremains attached to the foundation and insures theproper fundamentalalinement of the machine, which is most important to its perfect workingat high speed.

The mid portion or section A is the lower half of the cylindricalhousing, containing the grinding-stones of the mill, making a junctionwith the base at each end by inside flanges a and bolts, as indicated bydotted lines in Fig. 2, and is provided with marginal ears a at thehorizontal diameter plane for At each end of the mid portion A arebrackets b, sustaining long bearings for the main shaft S, constructedin the usual forni for Babbitt fillings to obtain exact alinement forthe shaft. At the end nearest the running-stone the bracket is extendedinto or provided with a screw-seat 19, carrying a screw .9 in theprolonged axis of the shaft, for a purpose presently to be explained.

The shaft S, seated in its bracket-bearings 1) passes through the hollowannular bedstone 0 and carries the running-stone C rigidly securedthereto, both stones being set in casings 0 0 respectively, in the usualmanner. The shaft is allowed a limited amount of end play forlongitudinal adjustment by the screw 8, which is provided with ahandwheel to and a handled set-nut n. The screw 8 bears, with aninterposed washer s of steel or gun-metal, against the end of the shaftS, as indicated in Fig. 2, and determines the outer limit of the spacebetween the stones, no inner limit other than the face of the stonesbeing necessary, as the grain itself in being ground tends to hold thefaces of the stones apart.

The bed-stone casing c is furnished at diametrically opposite sides withtrunnions if, provided with bearings in the casing, as follows: The midhousing-section A is provided at corresponding opposite sides with thelower half of box-shaped enlargements (1. a At one side the enlargementa is fitted to receive a bearing-block d, having vertical pivotextensions and a horizontal aperture for the reception of a trunnion tof the casing c. The opposite box-shaped opening a? is plain and fittedto receive and furnish a sliding fit for a bearing-block d horizontallyperforated to receive the remaining trunnion of the casing c and heldadjustably between set-screws 6 e threaded through opposite end Walls ofthe enlarement a I may, however, substitute an adjustable block, such aslast described, for the pivotal block first mentioned. There is thusconstituted a means for adjusting or tramming the bed-stone in oneplane, the adjustment in the opposite plane being effected by set-screwsf f (two or more,) threaded through the wall of the top housing A aboveand below the horizontal axis.

The cover or top part A of the housing is the corresponding upper halfof the general cylindrical casing, provided with corresponding ears,&c., with end apertures for the feedin chute h and with correspondingupper halves of the enlargements a a It is provided with two standardsi, carrying the receiving-funnel 2' and upon a cross-brace d between thestandards is pivoted the shaker or trough j for conveying grain from thefunnel 2' to the feed-in chute h. To the trough j is bolted a bar j,connecting with a vibrating arm is, pivoted to the end of the casing andbifurcated at its lower end to straddle an eccentric m on the shaft S.The rotation of the eccentric therefore causes apivotal oscillation ofthe trough j from side to side. Upon disengaging the top A and removingit the stones, shaft, 850., are exposed conveniently for repairs,adjustment, removal, &c., while the feed mechanism, &c., remainsconnected and ready for operation upon replacing the top A in position.

The machine thus constructed, with wide bearings for the shaft at bothsides of the running-stone, and when properly adjusted and in connectionwith the adjustment for fine or coarse grinding shown, maybe run athigher speed than is generally practicable in mills of this class, andthe relative capacity of the mill is thereby increased.

To insure proper clearance in delivery, I attach to the casing of therunning-stone a radial wing 0, which assists in maintaining a freeoutward flow of the ground material and ample clearance-space for therotating casing.

The shaft S is provided with a feed-screw conveyor operating in thehollow center of the bed-stone casing, as indicated by dotted lines inFig. 4.

I claim as my invention and desire to secure by Letters Patent of theUnited States 1. In a grinding-mill of the characterindicated asupporting-frame and easing embodying in combination the followingelements or features of construction: viz: abase adapted to be attachedto and remainpermanently upon a fixed foundation; an intermediateremovable section fitted to said base and extending to the axial planeof the shaft, constituting the lower half of the grinding-chamher andprovided with outer supportingbrackets for the shaft-bearings, andadjustable supports for the bed-stone; andaremovable cover constitutingthe upper half of the grinding-chamber carrying the hopper, grainfeedconduits and agitating devices adapted to be brought into operativeengagement with the shaft by placing the cover in position,substantially as set forth.

2L In a grinding-mill of the character indicated, the combination of thecasing or housing divided on the axial plane of the shaft, provided withopposite box extensions similarly divided; perforated blocks resting inthe lower half of said box extensions, a bedstone casing with oppositetrunnions extended into said blocks, thereby suspending the bed stone inthe housing and adjusting-screws threaded through the wall of one orboth of the housing extensions, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

ORVILLE SIMPSON.

Witnesses:

L. M. HOSEA, FRANK K. BOWMAN.

